ELI5: Explain Like I'm 5

British electric multiple units

British electric multiple units (EMUs) are like big trains made up of smaller train cars that run on electricity. EMUs are a type of train that can be used on different rail lines all across Britain. They have electric motors that are powered by overhead wires or third rails that run alongside the track, instead of using diesel or steam engines.

EMUs are different from other types of trains because they consist of several carriages (or cars) that are all connected together. These trains can have as few as two carriages or as many as eight or more. The carriages are built to be lightweight and are made of materials such as aluminum to help them move more easily and quickly.

Some EMUs have sleek, modern designs with features like automatic doors, comfortable seating, and air conditioning. Others are more functional, designed for commuter travel, with hard plastic seats and grab handles for standing passengers.

EMUs are very popular in Britain for many reasons, including their reliability, low emissions, and efficient use of energy. They are commonly used for both short and long-distance journeys, with express services running between major cities, and slower services connecting smaller towns and villages.

Overall, British electric multiple units are trains that run on electricity and consist of several connected carriages designed to carry passengers across the country efficiently and comfortably.